Vita Cocoannounced via twitter that they had signed Rihanna! Rihanna has made numerous tweets about her love for the coconut water. She now joins celebs like Madonna and the Red Hot Chili Peppers who are also strong voices for the brand. I've never tried it before but I think I'm going to have to give it a try just to see what the hype is about. Below, Rihanna reveals the cover to her new single, "Man Down."